Mass-Enhanced Fermi Liquid Ground State in Na${}_{1.5}$Co${}_2$O${}_4$

Abstract

Magnetic, transport, and specific heat measurements have been performed on layered metallic oxide Na${}_{1.5}$Co${}_2$O${}_4$ as a function of temperature $T$. Below a characteristic temperature $T^{\ast }$=30$-$40 K, electrical resistivity shows a metallic conductivity with a $T^2$ behavior and magnetic susceptibility deviates from the Curie-Weiss behavior showing a broad peak at $\sim$14 K. The electronic specific heat coefficient $\gamma$ is $\sim$60 mJ/molK${}^2$ at 2 K. No evidence for magnetic ordering is found. These behaviors suggest the formation of mass-enhanced Fermi liquid ground state analogous to that in $d$-electron heavy fermion compound LiV${}_2$O${}_4$.

4 pages, 4 figures, to be published in Phys. Rev. B 69 (2004)

References in corpus (6)

• Heavy-fermion and spin-liquid behavior in a Kondo lattice with magnetic frustration
• The electronic structure of the heavy fermion metal $Li{V}_2{O}_4$
• Spin fluctuations in a magnetically frustrated metal, LiV2O4
• Synthesis, Characterization and Magnetic Susceptibility of the Heavy Fermion Transition Metal Oxide LiV_{2}O_{4}
• Specific Heat (1.2-108 K) and Thermal Expansion (4.4-297 K) Measurements of the 3d Heavy Fermion Compound LiV_{2}O_{4}
• LiV${}_2$O${}_4$: frustration induced heavy fermion metal

Cited by in corpus (10)

• Flat bands, strange metals, and the Kondo effect
• Multi-orbital analysis on the Superconductivity in Na_{x}CoO_{2} \cdot y H_{2}O
• Electron Correlation Driven Heavy-Fermion Formation in LiV2O4
• Optical study of interactions in a d-electron Kondo lattice with ferromagnetism
• Magnetic and Electronic Properties of Li${}_x$CoO${}_2$ Single Crystals
• Synthesis, Characterization, and Magnetic Properties of gamma-NaxCoO2 (0.70 < x <0.84)
• Thermal and Electrical Properties of gamma-NaxCoO2 (0.70 < x < 0.78)
• Novel electronic states realized by the interplay between Li diffusion and Co${}^{3+}$$/$Co${}^{4+}$ charge ordering in Li${}_{\mathrm{x}}$CoO${}_2$
• Helimagnetic Structure and Heavy-Fermion-Like Behavior in the Vicinity of the Quantum Critical Point in Mn${}_3$P
• Ab-initio studying of spin states of sodium cobaltate Na${}_{2/3}$CoO${}_2$